/*
Copyright 2019-2021 The Matrix.org Foundation C.I.C.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import React, { ChangeEvent, SyntheticEvent } from "react";
import { logger } from "matrix-js-sdk/src/logger";

import { _t } from "../../../../../languageHandler";
import SdkConfig from "../../../../../SdkConfig";
import { Mjolnir } from "../../../../../mjolnir/Mjolnir";
import { ListRule } from "../../../../../mjolnir/ListRule";
import { BanList, RULE_SERVER, RULE_USER } from "../../../../../mjolnir/BanList";
import Modal from "../../../../../Modal";
import { MatrixClientPeg } from "../../../../../MatrixClientPeg";
import ErrorDialog from "../../../dialogs/ErrorDialog";
import QuestionDialog from "../../../dialogs/QuestionDialog";
import AccessibleButton from "../../../elements/AccessibleButton";
import Field from "../../../elements/Field";
import SettingsTab from "../SettingsTab";
import { SettingsSection } from "../../shared/SettingsSection";
import SettingsSubsection, { SettingsSubsectionText } from "../../shared/SettingsSubsection";

interface IState {
    busy: boolean;
    newPersonalRule: string;
    newList: string;
}

export default class MjolnirUserSettingsTab extends React.Component<{}, IState> {
    public constructor(props: {}) {
        super(props);

        this.state = {
            busy: false,
            newPersonalRule: "",
            newList: "",
        };
    }

    private onPersonalRuleChanged = (e: ChangeEvent<HTMLInputElement>): void => {
        this.setState({ newPersonalRule: e.target.value });
    };

    private onNewListChanged = (e: ChangeEvent<HTMLInputElement>): void => {
        this.setState({ newList: e.target.value });
    };

    private onAddPersonalRule = async (e: SyntheticEvent): Promise<void> => {
        e.preventDefault();
        e.stopPropagation();

        let kind = RULE_SERVER;
        if (this.state.newPersonalRule.startsWith("@")) {
            kind = RULE_USER;
        }

        this.setState({ busy: true });
        try {
            const list = await Mjolnir.sharedInstance().getOrCreatePersonalList();
            await list.banEntity(kind, this.state.newPersonalRule, _t("labs_mjolnir|ban_reason"));
            this.setState({ newPersonalRule: "" }); // this will also cause the new rule to be rendered
        } catch (e) {
            logger.error(e);

            Modal.createDialog(ErrorDialog, {
                title: _t("labs_mjolnir|error_adding_ignore"),
                description: _t("labs_mjolnir|something_went_wrong"),
            });
        } finally {
            this.setState({ busy: false });
        }
    };

    private onSubscribeList = async (e: SyntheticEvent): Promise<void> => {
        e.preventDefault();
        e.stopPropagation();

        this.setState({ busy: true });
        try {
            const room = await MatrixClientPeg.safeGet().joinRoom(this.state.newList);
            await Mjolnir.sharedInstance().subscribeToList(room.roomId);
            this.setState({ newList: "" }); // this will also cause the new rule to be rendered
        } catch (e) {
            logger.error(e);

            Modal.createDialog(ErrorDialog, {
                title: _t("labs_mjolnir|error_adding_list_title"),
                description: _t("labs_mjolnir|error_adding_list_description"),
            });
        } finally {
            this.setState({ busy: false });
        }
    };

    private async removePersonalRule(rule: ListRule): Promise<void> {
        this.setState({ busy: true });
        try {
            const list = Mjolnir.sharedInstance().getPersonalList();
            await list!.unbanEntity(rule.kind, rule.entity);
        } catch (e) {
            logger.error(e);

            Modal.createDialog(ErrorDialog, {
                title: _t("labs_mjolnir|error_removing_ignore"),
                description: _t("labs_mjolnir|something_went_wrong"),
            });
        } finally {
            this.setState({ busy: false });
        }
    }

    private async unsubscribeFromList(list: BanList): Promise<void> {
        this.setState({ busy: true });
        try {
            await Mjolnir.sharedInstance().unsubscribeFromList(list.roomId);
            await MatrixClientPeg.safeGet().leave(list.roomId);
        } catch (e) {
            logger.error(e);

            Modal.createDialog(ErrorDialog, {
                title: _t("labs_mjolnir|error_removing_list_title"),
                description: _t("labs_mjolnir|error_removing_list_description"),
            });
        } finally {
            this.setState({ busy: false });
        }
    }

    private viewListRules(list: BanList): void {
        const room = MatrixClientPeg.safeGet().getRoom(list.roomId);
        const name = room ? room.name : list.roomId;

        const renderRules = (rules: ListRule[]): JSX.Element => {
            if (rules.length === 0) return <i>{_t("labs_mjolnir|rules_empty")}</i>;

            const tiles: JSX.Element[] = [];
            for (const rule of rules) {
                tiles.push(
                    <li key={rule.kind + rule.entity}>
                        <code>{rule.entity}</code>
                    </li>,
                );
            }
            return <ul>{tiles}</ul>;
        };

        Modal.createDialog(QuestionDialog, {
            title: _t("labs_mjolnir|rules_title", { roomName: name }),
            description: (
                <div>
                    <h3>{_t("labs_mjolnir|rules_server")}</h3>
                    {renderRules(list.serverRules)}
                    <h3>{_t("labs_mjolnir|rules_user")}</h3>
                    {renderRules(list.userRules)}
                </div>
            ),
            button: _t("action|close"),
            hasCancelButton: false,
        });
    }

    private renderPersonalBanListRules(): JSX.Element {
        const list = Mjolnir.sharedInstance().getPersonalList();
        const rules = list ? [...list.userRules, ...list.serverRules] : [];
        if (!list || rules.length <= 0) return <i>{_t("labs_mjolnir|personal_empty")}</i>;

        const tiles: JSX.Element[] = [];
        for (const rule of rules) {
            tiles.push(
                <li key={rule.entity} className="mx_MjolnirUserSettingsTab_listItem">
                    <AccessibleButton
                        kind="danger_sm"
                        onClick={() => this.removePersonalRule(rule)}
                        disabled={this.state.busy}
                    >
                        {_t("action|remove")}
                    </AccessibleButton>
                    &nbsp;
                    <code>{rule.entity}</code>
                </li>,
            );
        }

        return (
            <div>
                <p>{_t("labs_mjolnir|personal_section")}</p>
                <ul>{tiles}</ul>
            </div>
        );
    }

    private renderSubscribedBanLists(): JSX.Element {
        const personalList = Mjolnir.sharedInstance().getPersonalList();
        const lists = Mjolnir.sharedInstance().lists.filter((b) => {
            return personalList ? personalList.roomId !== b.roomId : true;
        });
        if (!lists || lists.length <= 0) return <i>{_t("labs_mjolnir|no_lists")}</i>;

        const tiles: JSX.Element[] = [];
        for (const list of lists) {
            const room = MatrixClientPeg.safeGet().getRoom(list.roomId);
            const name = room ? (
                <span>
                    {room.name} (<code>{list.roomId}</code>)
                </span>
            ) : (
                <code>list.roomId</code>
            );
            tiles.push(
                <li key={list.roomId} className="mx_MjolnirUserSettingsTab_listItem">
                    <AccessibleButton
                        kind="danger_sm"
                        onClick={() => this.unsubscribeFromList(list)}
                        disabled={this.state.busy}
                    >
                        {_t("action|unsubscribe")}
                    </AccessibleButton>
                    &nbsp;
                    <AccessibleButton
                        kind="primary_sm"
                        onClick={() => this.viewListRules(list)}
                        disabled={this.state.busy}
                    >
                        {_t("labs_mjolnir|view_rules")}
                    </AccessibleButton>
                    &nbsp;
                    {name}
                </li>,
            );
        }

        return (
            <div>
                <p>{_t("labs_mjolnir|lists")}</p>
                <ul>{tiles}</ul>
            </div>
        );
    }

    public render(): React.ReactNode {
        const brand = SdkConfig.get().brand;

        return (
            <SettingsTab>
                <SettingsSection>
                    <SettingsSubsectionText>
                        <strong className="warning">{_t("labs_mjolnir|advanced_warning")}</strong>
                        <p>{_t("labs_mjolnir|explainer_1", { brand }, { code: (s) => <code>{s}</code> })}</p>
                        <p>{_t("labs_mjolnir|explainer_2")}</p>
                    </SettingsSubsectionText>
                    <SettingsSubsection
                        heading={_t("labs_mjolnir|personal_heading")}
                        description={_t("labs_mjolnir|personal_description", {
                            myBanList: _t("labs_mjolnir|room_name"),
                        })}
                    >
                        {this.renderPersonalBanListRules()}
                        <form onSubmit={this.onAddPersonalRule} autoComplete="off">
                            <Field
                                type="text"
                                label={_t("labs_mjolnir|personal_new_label")}
                                placeholder={_t("labs_mjolnir|personal_new_placeholder")}
                                value={this.state.newPersonalRule}
                                onChange={this.onPersonalRuleChanged}
                            />
                            <AccessibleButton
                                type="submit"
                                kind="primary"
                                onClick={this.onAddPersonalRule}
                                disabled={this.state.busy}
                            >
                                {_t("action|ignore")}
                            </AccessibleButton>
                        </form>
                    </SettingsSubsection>
                    <SettingsSubsection
                        heading={_t("labs_mjolnir|lists_heading")}
                        description={
                            <>
                                <strong className="warning">{_t("labs_mjolnir|lists_description_1")}</strong>
                                &nbsp;
                                <span>{_t("labs_mjolnir|lists_description_2")}</span>
                            </>
                        }
                    >
                        {this.renderSubscribedBanLists()}
                        <form onSubmit={this.onSubscribeList} autoComplete="off">
                            <Field
                                type="text"
                                label={_t("labs_mjolnir|lists_new_label")}
                                value={this.state.newList}
                                onChange={this.onNewListChanged}
                            />
                            <AccessibleButton
                                type="submit"
                                kind="primary"
                                onClick={this.onSubscribeList}
                                disabled={this.state.busy}
                            >
                                {_t("action|subscribe")}
                            </AccessibleButton>
                        </form>
                    </SettingsSubsection>
                </SettingsSection>
            </SettingsTab>
        );
    }
}
